Possibilianism does not suggest free rein to believe whatever strikes one’s fancy. It is not tantamount to "anything goes". We know a great deal, not only about the cosmos and molecules, but also about human yearning, fallibilities, poor memories and our extraordinary ability to fabricate any variety of fantastic but utterly untrue stories. Within the realm of what is addressable, we profitably apply logic to further knowledge. Possibilianism is "anything goes at first" - but we then use science to rule out parts of the possibility space, and often to rule in new parts.